Database Migration Services: Any Source, Any Target, Zero Downtime
JusDB migrates databases across every pattern — Oracle to PostgreSQL, MySQL to TiDB, on-premises to AWS/GCP/Azure, version upgrades, and cloud-to-cloud exits. We use the full migration toolkit (Debezium, gh-ost, pglogical, AWS DMS) with CDC-based live replication, parallel run validation, and a tested rollback plan before we start.
Migrating a specific engine? Oracle→PostgreSQL → MySQL migrations → MySQL→TiDB →
Migration Patterns We Handle
Every migration pattern has a different risk profile, toolchain, and cutover strategy. JusDB has executed all four — including the highest-risk heterogeneous engine replacements.
On-Premises → Cloud
Risk: Low- → Oracle on bare metal
- → MySQL on VMware
- → SQL Server on Windows Server
- → PostgreSQL on Linux
- AWS RDS / Aurora
- GCP Cloud SQL
- Azure Database
- Self-managed on EC2/GCE
Network-level replication via DMS or Debezium CDC, live cutover with < 5 minutes downtime during off-peak window.
Engine Replacement (Heterogeneous)
Risk: High- → Oracle → PostgreSQL
- → MySQL → PostgreSQL
- → SQL Server → PostgreSQL
- → MySQL → TiDB
- PostgreSQL (any cloud)
- TiDB (horizontal scale)
- MariaDB
- Aurora-compatible
Schema conversion (pgloader, AWS SCT, Ora2pg), stored procedure rewrite, application query adaptation, parallel run validation.
Version Upgrade
Risk: Medium- → MySQL 5.7 → 8.0
- → PostgreSQL 12 → 16
- → MongoDB 4.x → 6.x
- → Cassandra 3 → 4
- Latest stable version
- Cloud-managed version
Blue-green upgrade with parallel testing, gh-ost or pg_upgrade, incremental replica promotion. Rollback-safe.
Cloud → Cloud / Cloud Exits
Risk: Low–Medium- → RDS → self-managed EC2
- → Azure SQL → AWS RDS
- → Atlas → self-hosted Mongo
- Any cloud or on-prem target
CDC replication maintains sync during migration window; traffic shifted via connection string swap or proxy.
The JusDB Migration Toolkit
One-size-fits-all migration tools do not exist. JusDB selects the right tool combination for your source engine, target engine, data volume, and downtime budget.
CDC & Replication
Open-source CDC platform — captures row-level changes from MySQL, PostgreSQL, MongoDB, Oracle binlogs/WAL/oplog and streams to Kafka.
Managed migration service for heterogeneous migrations (Oracle→PG, MySQL→Aurora). Good for bulk load + CDC, limited for complex schema transforms.
Logical replication extension for PostgreSQL — enables cross-version PG replication and live cutover without pg_upgrade downtime.
Lightweight MySQL binlog readers — simpler than Debezium for MySQL-only CDC pipelines.
Schema Migration & Conversion
Online schema changes for MySQL — zero-downtime ALTER TABLE without table locks. The standard for large MySQL tables (>1B rows).
Bulk data loading and schema conversion for MySQL→PostgreSQL, SQLite→PostgreSQL, CSV imports.
Oracle to PostgreSQL migration toolkit — converts schema, stored procedures (PL/SQL→PL/pgSQL), and data.
Automated schema conversion for Oracle→RDS, SQL Server→Aurora. Good starting point; always requires manual refinement.
Validation & Testing
Verifies row-level data consistency between MySQL source and target — runs without locking tables.
Schema and data comparison between PostgreSQL databases for migration validation.
Open-source table-level diff tool — works across MySQL, PostgreSQL, BigQuery, Snowflake.
JusDB replays production query load against the target database before cutover to validate performance parity.
Migration Risk Management
Every migration has risks. JusDB's risk framework addresses each one explicitly — before the migration starts, not during it.
| Risk | JusDB Mitigation |
|---|---|
Data Loss | CDC replication with lag monitoring; dual-write period before cutover; checksum validation post-migration. |
Extended Downtime | Zero-downtime migrations using CDC + atomic cutover. Most migrations achieve < 5 minutes application downtime. |
Application Compatibility | SQL dialect analysis before migration; query rewrite catalogue; parallel run period with application traffic split. |
Performance Regression | Load test on target with production query sample before cutover; query plan comparison; index audit on target. |
Rollback Failure | JusDB defines and tests a rollback plan before the migration starts — including reverse replication from target back to source. |
How a JusDB Migration Works
Discovery
Inventory source schema, row counts, data types, stored procedures, and application queries. Identify incompatibilities before a single row moves.
Design
Schema conversion plan, CDC pipeline design, cutover window design, rollback plan. Written runbook before work starts.
Migrate & Validate
Bulk data load + CDC lag catch-up. Parallel run period: validate data integrity (checksums), query correctness, and performance on target.
Cutover
Atomic cutover with < 5 min downtime. Application connection string swap. Source kept in read-only sync for rollback window (typically 48–72 hours).
FAQ
Plan your migration before you start it
JusDB audits your source database, designs the migration architecture, builds the rollback plan, and executes the migration — any source, any target, any cloud.